1. S.J. Connon, Org. Biomol. Chem. (2007) 3407.
2. T. Henkel, R.M. Brunne, H. Mueller, F. Reichel, Angew. Chem. Int. Ed. 38 (1999) 643.
3. K.W. Henderson, W.J. Kerr, J.H. Moir, Chem. Commun. (2000) 479.
4. V. Gotor-Fernandez, P. Fernandez-Torres, V. Gotor, Tetrahedron Asy. 17 (2006) 2558.
5. M.F.A. Adamo, V.K. Aggarwal, M.A. Sage, J. Am. Chem. Soc. 122 (2000) 8317.